The historical maps and the maps of China's provinces (any maps without
sources given) were all specially made
for this site. The base contour map was created by tracing the map of
China on p. 56 of the 1968 Britannica World Atlas. Province
boundaries and approximate historical boundaries were drawn freehand by
consulting other reference works, such as the Zhongguo lishi ditu ji
series. No attempt has been made to take into account the changes in the
coastline over the centuries, as all the maps are made from the same base map.